You feel full sooner
Meals end earlier and naturally. The plate stays half full and it doesn't feel like a sacrifice.
★★★★★ Every lot tested · certificate included
Lose weight with one weekly peptide.
Reta (retatrutide) is the next-generation weight-loss peptide, often called “GLP-3”. It works on three hunger and metabolism signals at once, so you feel full sooner and stop fighting food all day. In a 48-week clinical trial, the highest dose averaged 24% body-weight loss.1
Just €79 for a 10 mg vial, delivered in 2–5 working days.
- Quiets constant hunger and food noise
- Smaller portions without the daily battle
- Shipped from inside the EU, no customs
- Pay by MB Way, Multibanco, card or transfer
No subscriptionPlain, discreet boxReal people on WhatsApp
Reta 10 mgIn stock · ships today
3 signalsGLP-1 · GIP · glucagon
🧪Every lot tested
📄Certificate in the box
🇪🇺Ships from inside the EU
💬1:1 support on WhatsApp
Your numbers
Finally lose weight without fighting hunger, dieting harder, or feeling miserable.
BEFOREAFTER
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How much could you lose by next summer?
kg
60 kg180 kg
At the clinical trial average,
that's about
Calculated with the 24.2% average weight loss at the highest dose in a 48-week phase 2 clinical trial.1 Not a promise: results vary from person to person.
Start now · €79
How it works
Quiet the hunger signals.
Feel full on less.
Most diets fail for one reason: you're hungry the whole time. Reta works on the signals that make you hungry, instead of asking you to fight them with willpower.
The cravings calm down
The constant thinking about food, the 11pm fridge visits, the "just one more" all get quieter.
Your body uses more energy
This is the signal the older peptides don't touch. It's a big part of why researchers are so excited about Reta.
Why Reta
One signal. Two signals. Three.
Each generation of weight-loss peptide has added a signal, and the average results have climbed with it.
Average body-weight loss at the highest dose in each molecule's published trial: semaglutide STEP 1,2 tirzepatide SURMOUNT-1,3 retatrutide phase 2.1 These are separate trials with different lengths and participants, not a head-to-head comparison. Reta reached its figure in the shortest time.
How it works
At your door in 2–5 working days.
Ordering takes a minute. A real person confirms everything with you before you pay.
Synthosonline
Hi Ana! This is Rita from Synthos. Thanks for your order of Reta 10 mg.
It ships today from our EU warehouse. 2–5 working days to Lisbon, no customs, and the certificate for your lot is in the box.
Perfect. Can I pay with MB Way?
Of course. Sending the details now.
What to expect
What people notice first.
Based on what was reported in the clinical research. Everyone is different.
The noise gets quiet
Hunger and food thoughts calm down. This is usually the first thing people mention.
Portions shrink
You eat less without planning to, and the weight starts to follow.
Steady progress
In the trial, weight kept coming down across the full 48 weeks.1
Common side effects
Nausea, diarrhoea or constipation were the most common, mostly mild and early on.1
Pricing
Lab-tested. Priced for you.
One simple price. No subscription and no membership fee.
Weight loss● In stock
Reta
Retatrutide
10 mg vial
€79
- Sealed, freeze-dried vial
- Certificate of analysis for your lot
- Tracked, discreet delivery
- Support on WhatsApp
Planning ahead?● Ask us
More than one vial
Ordering for a longer period, or for more than one person? Choose the quantity at checkout and we'll confirm the best price for your order when we contact you.
- Same EU shipping, no customs
- One certificate per lot
- Same payment options
🧪Every lot tested
🚚2–5 working days
🔒Pay after you confirm
💬English & Portuguese
FAQ
We've got you.
You have questions. We have straight answers.
What is Reta?
Reta is retatrutide, often called “GLP-3”: a next-generation peptide that acts on three signals involved in hunger and metabolism: GLP-1, GIP and glucagon. Older weight-loss peptides act on one (semaglutide) or two (tirzepatide).
How is it different from semaglutide or tirzepatide?
It adds the glucagon signal, which is linked to how much energy the body uses. In its 48-week phase 2 trial, the highest dose averaged 24.2% body-weight loss, compared with 14.9% for semaglutide (68 weeks) and 20.9% for tirzepatide (72 weeks) in their own trials. These were separate trials, not a direct comparison.
How much weight could I lose?
Results vary a lot between people. In the phase 2 trial, average loss at the highest dose was 24.2% over 48 weeks. The calculator above uses that average to give you a rough idea, not a promise.
Is it approved for human use?
No. Reta is still in clinical trials and is not approved by the EMA or Infarmed. We supply it for research purposes only, to adults aged 18 and over.
What side effects were reported in the research?
The most common were digestive: nausea, diarrhoea, vomiting and constipation, mostly mild to moderate and more frequent at the start. Some participants had a higher resting heart rate.
How is it shipped, and will I pay customs?
It ships from a warehouse inside the EU, so there is no customs check, no import VAT and no fee at the door. Delivery takes 2–5 working days in a plain, tracked box.
How do I pay?
You don't pay anything at checkout. A Synthos representative contacts you to confirm the order, then you pay by MB Way, Multibanco, card or bank transfer.
What's in the box?
A sealed 10 mg vial of freeze-dried powder and the certificate of analysis for its lot.
How do I contact you?
Once you've left your details, your Synthos representative stays in touch by phone or WhatsApp. A real person answers, in English or Portuguese.
Get started
Ready to quiet the cravings?
Ready to quiet the cravings?
Start for €79.
One weekly peptide, three signals, shipped from inside the EU with no customs.
Order nowNo subscriptionPay after you confirmCertificate included